14binggreen

 

week14-1_timer

先用一個茶壺

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutDisplayFunc(display);

    glutMainLoop();

}

茶壺會90度轉

#include <GL/glut.h>

float angle =0;

void timer (int t)

{

    glutTimerFunc(500,timer,t+1);

    angle+=90;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutTimerFunc(3000,timer,0);

    glutDisplayFunc(display);

    glutMainLoop();

}

14-2_timer_play

按鍵盤任意鍵 讓茶壺轉動

#include <GL/glut.h>

float angle =0;

void timer (int t)

{

    glutTimerFunc(33,timer,t+1);

    angle+=3;

    glutPostRedisplay();

}

void keyboard(unsigned char key,int x,int y)

{

    glutTimerFunc(0,timer,0);

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    ///glutTimerFunc(3000,timer,0);

    glutKeyboardFunc(keyboard);

    glutDisplayFunc(display);

    glutMainLoop();

}

git 上傳

week14-3

用滑鼠控制

#include <GL/glut.h>

float angle =0,newAngle=0,oldAngle=0;

float oldx=0;

void timer (int t)

{

    if(t<100) glutTimerFunc(33,timer,t+1);

    float alpha = t/100.0;

    angle=alpha*newAngle + (1-alpha)*oldAngle;

    glutPostRedisplay();

}

void keyboard(unsigned char key,int x,int y)

{

    glutTimerFunc(0,timer,0);

}

void mouse(int button,int state,int x,int y)

{

    if(state==GLUT_DOWN) oldAngle = angle;

    if(state==GLUT_UP) oldAngle = angle;

    oldx=x;

    glutPostRedisplay();

}

void motion(int x,int y)

{

    angle +=x-oldx;

    oldx=x;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    ///glutTimerFunc(3000,timer,0);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}